arcus

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Related to arcus senilis: arcus juvenilis, corneal arcus

arcus

[′ar·kəs]
(meteorology)
A dense and horizontal roll-shaped accessory cloud, with more or less tattered edges, situated on the lower front part of the main cloud.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

arcus

A low, horizontal cloud formation associated with the leading edge of thunderstorm outflow (i.e., gust front). Roll clouds and shelf clouds are both types of arcus clouds.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
For arcus senilis, corneal scars, corneal infiltrates, abnormal corneal shape/size, e.g.: keratoconus.
Arcus corneae (or arcus senilis) is a grey-white-yellowish opacity near the periphery of the cornea, though separated from the limbic margin by a clear corneal zone.